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This paper presents the performance of several types of inverters and the data they collected in the MARAMURES region of Romania. They were run in various different environments, angles of inclination and geographical positions. Each type of inverter is equipped with an application which helps the operator keep a record of daily production, track instant production and even check the monthly and annual power output. The last part compares the real energy production with a forecast generated by the PVGIS platform. This shows the differences in efficiency between two photovoltaic installations of the same type and size, due to different angles of elevation and azimuth.